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iptmon: Simple iptables bandwidth monitor

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iptmon is a script used to create and update iptables firewall rules to count transmit and recieve traffic to/from each host. It is intended to be triggered by dnsmasq using the --dhcp-script option, so that as new hosts are added and old leases expire, rules are updated dynamically.

Static hosts defined either in /etc/hosts or through uci set dhcp.domain[] are supported since v0.1.0.

Packet and byte counts can then be scraped by collectd using the iptables plugin. See files/etc/collectd/conf.d/iptables.conf for configuration.

Furthermore, collectd can push data to InfluxDB, which can in turn be used as a data source for Grafana dashboards.

Inspired by wrtbwmon.


Dependencies

To make use of iptmon, you should already be using luci-app-statistics and collectd to collect and process metrics.

The iptables module of collectd is used to collect per-host metrics.

iptmon depends on dnsmasq version >=2.80-16, which merged a PR to enable script-arp so make sure your dnsmasq package is up-to-date.

If you are using luci-app-statistics prior to git commit 4778aa6 you will need to upgrade as this commit merged a PR to fix the ip6tables firewall statistics view in LuCI.

Note that if you have software offloading enabled iptmon will not be able to track bandwidth usage properly.

Add feed

If you are building your own image from source and want to include iptmon:

$ echo "src-git iptmon https://github.com/oofnikj/iptmon.git" >> feeds.conf
$ scripts/feeds update && scripts/feeds install iptmon
$ make menuconfig

Installation on OpenWrt

Head over to the releases page to downloaded the latest .ipk.

iptmon is a shell script, so it should work on all architectures.

# VERSION=0.1.4
# wget https://github.com/oofnikj/iptmon/releases/download/v${VERSION}/iptmon_${VERSION}-1_all.ipk -O iptmon_${VERSION}-1_all.ipk
# opkg install ./iptmon_${VERSION}-1_all.ipk

Removal

# opkg remove iptmon

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